Frac,
If you have the means, I would highly recommend following the advice as offered by Greenjacket, Spark, C4 and others. Bottom line- the quality G3/G2+ image intensifier tubes made by US companies such as ITT and Litton will not only perform significantly better than their less expensive Russian counterparts (or American counterparts for that matter), but you will also experience much longer service life from your tubes. Plus, all of the current products made by these manufacturers feature tubes that are automatically protected from incidental exposure to bright light, something that can serious damage older tubes. Finally, even if you do encounter problems, it's nice to be able to effect warranty repairs here in the US. The downside, obviously, is that you have to pay more.
From there, it's simply a matter of deciding whether you prefer a monocular, binocular or rifle scope. The latter is generally distinguished by offering a moderate amount of magnification (usually 3X or 4X), while the monoculars and binoculars most often provide a non-magnified 1X image. I personally find a moderate amount of magnification to be very useful, but your expected usage will dictate what's best for you.